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    SubjectRe: Pentium bug fix
    On Thu, 18 Dec 1997, Richard B. Johnson wrote:

    > Linus discovered that the F00F bug actually attempted to write to
    > the IDT. This made the trap easier. The IDT was simply marked present,
    > but read-only. The resulting code became trivial because nobody but
    > the kernel ever writes to the IDT (it doesn't exist in user space).

    Wee historical note. Linus "discovered" this via a call from Intel
    engineering. The earliest fix was based on a reverse engineered code which
    also originated with Intel... considerable improved/debugged of course.

    john alvord


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